Toothbrush



FIG. 1 is a side elevational view of a toothbrush embodying my new design;

FIG. 2 is an elevational view of the opposite side thereof;

FIG. 3 is an end elevational view as seen from the right of FIG. 1;

FIG. 4 is a left end elevational view thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a toothbrush, as shown and described. 